Air conditioning system



Oct. 22, 1935. J. A. SPACE AIR CONDITIONING SYSTEM Filed April 14, 19315 Sheets-Sheet l INVENTOR JAMES A. SPACE.

ATTORNEY Oct. 22, 1935. A, SPACE 2,018,236

AIR CONDITIONING SYSTEM Filed April 14, 1931 3 Sheets-Sheet 2 IINVENTORJAMEJ A.5PAC,E

ATTORNEY Oct. 22, 1935. J. A. SPACE AIR CONDITIONING SYSTEM Filed April14; 1951 3 Sheets-Sheet 3 2 "III ATTORNEY Patented Oct. 22, 1935 PATENT;OFFICE 2,018,236 AIR CONDITIONING SYSTEM James A. Space, East Orange, N.J., assignor to Doherty Research. Company, New York, N. Y., acorporation of Delaware Application April 14, 1931, Serial No. 529,911

16Claims. (01. 257-4) This invention relates to 'air conditioning,heating and cooling; and more particularly it concerns the ventilation,cooling and heating of ofiice buildings, hotels and similar structureswherein it is desired to maintain a predetermined temperature in a givenroom or rooms. The invention involves the employment of apparatus of theunit type adapted to facilitate the regulation and control ofventilation in variousparts of the room or building to be ventilated.

In the more recent practice inbuilding construction, in view of therapidly mounting value of floor space, efforts continually are beingmade to limit the demands upon such space for ordinary buildingoperating purposes. Central ventilation systems utilize much valuablespace with in modern oflice buildings, often amounting to as much as 600sq. ft. or more of floor space. To productively utilize the maximumamount of floor space, a unit system is here employed in which theindividual unit or units used for ventilatingv each room or flooroccupies a small amount of floor space at and immediately adjacent thespace normally occupied by the radiators normally employed.

Herefofore' heating and ventilating units of the unit type adapted forheating and ventilating buildings have generally involved the use of ahousing built adjacent a wall of the room to be ventilated and incommunication with the air outside the building through the.buildingwall, or,where such housing is placed in front of a window,usuallythrough an opening in the window itself. The air drawn in from outsidewas then circulated over heating coils by meansof afan, and wasthereafter directed upwardly into the room from a point adjacent thewindow-sill or at a corresponding level. In certain instances theaforementioned units provide also for heating the air from the roombeing ventilated, the room air being circulated through openings in thebottom and top of the housing. 1

The commercial development of heating and Ventilaing apparatus of theunit type has, prior to the present invention, been restricted due tocertain objectionable features limiting the effectiveness of suchapparatus where large spaces are to be ventilated. Where such heatingunits were placed directly in front of windows, the conditioned airflowing upwardly from the housing moved closely adjacent the side of theroom in front of the window, at a point where normally an appreciableamount of fresh air will, through normal leakage, enter the room. At thesame time the portions of the room remote iron; the

at the same time the conditioned air is then in troduced into the roomat points adjacent the walls, so that a uniform ventilation of the roomwith fresh air cannot be effected without the use vof auxiliaryventilating fans.

' The present invention has been developed in 15 recognition of thepresent need for a ventilating system comprising a compact unit havinghigh heating and cooling efficiency, adapted for heating and ventilatingbuildings in winter and for cooling and ventilating buildings in summer,un- 20 der conditions whereby fresh conditioned air is introduced intothe room,-after removal of extraneous matter, dust, and the like,atpoints remote from the walls of the room, while at the same timeproviding for recirculation and reheat- 25 ing of room air underconditions adapted to permit to the greatest possible extent dilution ofthe recirculated air with any fresh air independent ly entering the roomaround or through the windows.

Among the more important objects of the present invention may be notedthe following:

To provide in a novel manner for uniformly supplying fresh, filtered andconditioned air to the room to be ventilated; to provide a novel airconditioning unit adapted for ventilating a room with heated air in coldweather and for ventilating the same with cool air in warm weather; toprovide a novel room-ventilating method and apparatus involving theutilization of two sources 4 of air supply whereby each of the saidsupplies of air is heated and is recirculated into the room quiteindependently of the other but under controlled conditions; to providea've'ntilation system and apparatus employing forced draft in which thevolume of conditioned air flowing to points in the mid portions of theroom or building being ventilated may be varied in accordance with thetemperature of the conditioned air; and

to provide in an air conditioning system for a novel metal windowsillconstruction adapted to provide within the sill a hidden inlet for freshair and to provide for the cleansing of air within the sill. I

. In its broadest scope, the invention involves I5 the use of a novelair conditioning system, convertible so as to be adapted either forcooling or heating air prior to introduction of thelatter into the roomto be ventilated. Fresh air is introduced into the room, at pointsremote from the windows and from the walls of the room, under forceddraft, preferably automatically controlled under the influence of thetemperature of the room or of that at any suitable point in theventilating system. The fresh air is drawn by an induced draft through ahollow window-sill, preferably of lightweight cast metal constructionand provided with an air filtering medium, the latter of which is in theform of a replaceable or removable filter cartridge.

In cold weather the filtered fresh air is drawn or flows over heatingelements, and the resultant heated air is conducted through wallconduits and is discharged into the room near the ceiling at one or moreselected points remote from the walls and windows. Simultaneously, airis withdrawn from the room at points near the floor and directly infront of each window, and it is thereafter heated and again introducedinto the room immediately in front of the respective window where it maybe diluted by fresh air entering around or through the window. Thisupward flow of air in front of the windows is induced by naturalconvection, in the preferred form of the invention.

During warm weather when fresh air may enter through raised windows, itis not necessary to recirculate and cool the room air adjacent thewindows. Therefore the portion of the fresh air flowing throughthe-hollow window-sills which is conducted over that part of the airconditioning means located in front of the windows is thereafterdirected to and mixes with the balance of the conditioned air flowingunder induced draft to the portions of the room remote from the windowsand walls.

In the accompanying drawings illustrating certain preferred forms of theinvention, Fig. 1 shows a portion of a room interior in elevation andincludes certain elements of the invention; Fig. 2 is a section taken onthe line 22 of Fig. 1, looking in the direction of the arrows, Fig. 3 isa plan view taken along the line 33 of Fig. 4, parts being broken awayto show the inner construction of the hollow window-sill; and adjacentparts; Fig. 4 is a vertical section through a hollow window-sill andventilator housing; Fig. 5 is a perspective view of a room havinga wallcasing with parts broken away to show the air conditioning equipment,the arrangement of .parts being that adapted for air heating; Fig. 6 isa perspective view of a portion of the air conditioning apparatus on asomewhat larger scale than Fig. 5, parts being broken away, thearrangement being that adapted for air cooling; and Fig. '7 .is aperspective view of a filter supporting box.

In the drawings, l6 designates a portion of a building wall extendingbetween two adjacent pilasters l 2, viewed from the interior of thebuilding. A sheet-metal housing or casing ll, having front and topmembers l6, l6, which may be of ornamental design if desired, isdisposed along the wall of the room between pilasters. The casing may beconstructed of other material than metal,such as wood, or other wellknown material of construction.

One or more windows, 20, are located in the wall between the pilasters.In the form shown in Figs. 1 and 5, two windows are thus disposed; andthe height of casing I4 is such that its top i 8 is positioned a'substantial distance below the level partitions 32, 32, serving toreinforce the casing, 10

to divide the front passageway longitudinally into the heat transferchambers 34 and 36; and to divide the rear passageway into air inletchambers 38, and 40.

The chambers 34 and 38 arelocated directly in 15 front of each window26; and the chambers 36 and 40 are located between adjacent windows (seeFig. 6). The rear passageway has an interior portion of reduced height,extending between adjacent windows and adjacent partitions 32, so thatchamber 40 is of less height than chamber 38.

An opening 42 in each partition 32 permits free communication betweenthe chambers 38 and 46 at all times. Likewise an opening in the lowerportion of partition 26 automatically controlled by a 25 pneumaticallyoperated damper 44 or -its equivalent, permits communication betweenchambers 36 and 40, under certain desired conditions hereinafterdesignated.

An opening 46 in the partition 26 controlled by a 30 door 48 permitscontrolled communication between chambers 34 and 36; and an opening 50in eachpartition 32 and controlled by a door 52 permits controlledcommunication between chambers 34 and 36. Access to doors 48 and 52 may35 be obtained through suitable openings in the casing adjacent theretoor by any other common means for the purpose.

For supplying heat-transfer fluid for conditioning air flowing throughcompartments 34 and 36, 40

a riser pipe 60, adapted to convey an air conditioning fluid is mountedin the wall and is pro-. vided with lateral extensions 62 disposedwithin the series of chambers 34 and 36; the opposite end of eachlateral extension ,62 being suitably con- ,5

nected with a fluid-return conduit 64 in well known manner. Eachextension 62 may be in the form of one or a plurality oftubular'heat-transfer elements such as finned pipes, pipe coils or thelike. consists of a conduit having mounted thereon a plurality of flatmetal heat-radiating fins or plates 66 arranged in parallel andextending throughout the length of the casing l4.

An opening 68, adapted to be closed when de- '55 sired by a louvermember 16 is provided in that portion of the member I6 forming the topof v each chamber 34. Likewise in the lower portion of the casing memberl6 that forms the front of each compartment there is provided an open- 5ing 12 adapted to be closed when desired by the louver l4.

' For" conducting fresh air into the building from outside the latter,there is provided a hollow metal window ledge member'86 preferably ofmetal or'5 alloy and in the form of a thln-walled-casting. A lightweight but tough, durable metal such as aluminum or an aluminum alloyhaving a thickness of from ya to inch or more has been found in practiceto be highly satisfactory, the metal 7 thickness varying according tothe stresses to which the window ledge is to be subjected in ordinaryuse.

The sill construction comprises metal supportting end members 82, 82 andan intermediate sup- 75 In the form shown, the radiator element 50porting member 84 of steel or the like, each having its lower flangedmargin grouted or otherwise secured in the building wall I0. The windowledge or plate 80 is supported on the members 82, 6 84 with its outerend extending beyond these members and depending beyond the wall. Themember 80 is secured to each of the said Supporting members by bolts 90,connecting the latter with internal flanges 9| on the former. 10 A sillmember 92 is supported by a transverse member 94 of angle iron, thelatter being mounted at its ends upon supporting members 96 secured tosupporting member 82. A lug orshoulder 98 on the member 80 cooperateswith a shoul- 15 der I on the'sill member 02 to assist in maintainingthe ledge 80 in the desired position, the

space between the shoulders 98 and I00 preferably being caulked with asuitable plastic packing material for preventing passage of air, dustand the like at this point. i

A removable closure member I02 cooperates with aflange I04 on the casingtop I8 and with ,a flange I 08 on the inner margin of sill 82 forpreventing direct communication between the in- 25 terior of the hollowwindow sill and the room excepting when desired. The sill member 02extends inwardly beyond the inner surface of the wall I0 a distancecorresponding to the width of 30 compartments 38 and 40.

within each hollow window sill. According to.a

preferred form of the invention, one such filtering unit is providedwithin the sill on each side of the'intermediate supporting member 84.Each 35 filtering 'unit comprises, in the form shown in Figs. 3, 4, and7, a box-like member IIO having solid side wallsand outer wall, andhaving a hinged lid 2 and a hinged bottom m, both of the latter beingmade of a foraminous material 40 such as metal screening or metal lathand adapted to permit free flow of air therethrough.

The inner side wall of the box H0 is open and is provided with a flangedcollar portion II6 to which both the top and bottom are hinged, and

45 which is adapted to cooperate with the adjacent margins of a sealingplate I25, the latter of which is secured to members 94 and to the innerflanged marginlof metal drain pansIII supported on the wall I0 below themetal window ledge 80.

, 50 Each said drain pan'slopes outwardly and downwardly and has anupturned outer margin 9 provided with openings I2I near its outermostportion. Plate I25 extends the width ofthe window and has its sidessecured to members 82.

Openings .I2'I are provided in plate I25, the margins around whichcooperate with the collar H6 to establish relatively fluid-tight sealsrespectively around the collars H8 of a pair of the boxes H0. Theinterior of each box is in perma- 60 nent communication through theopening in the inner side wall with the rear passageway of the casingI4, as clearly shown in Fig. 4.

A hinged U-shaped member II8 of resilient metal such as steel, isadapted normally to secure 65 the lid and bottom member of each box inclosed position, as illustrated in Fig. 7. A depending One or moreair-filtering unitsare supported hollow window-sill upon removal of theclosure I02.

A suitable filtering medium such as cloth, felt or coarse sheets offibrous material such as wood V pulp is secured upon the foraminous topand bot- 5 tom members H2 and II 4, these members being open for thepurpose. The sheets of filtering material thereafter are maintained inposition by the flanges on the top and bottom members after the latterare closed and are secured to- 10 gether in place by the clamping memberH8. A single sheet of filtering material long enough to cover bothmembers H2 and H4 may be employed,or these members may be covered byseparate sheets. Other modified forms of re-' placeable or removablefilter elements may be substituted for those shown.

For drawing air into the casing through the filter in the hollow windowledge and for distributing the same within a room to be ventilated,there is provided a fan or blower I 30 mounted in. the upper portion ofeach compartment 36 and so arranged as to draw air from the latter, anddischarge it upwardly into a conduit I32 within the outer building wall.The upper end of the conduit I32 may be connected with a horizontal airdistributing manifold I34, preferably located near the ceiling andhavinglouver-controlled openings I36 located at spaced pointslongitudinally thereof and'in its end for conducting the fresh air topoints remote from the building walls before its introduction into theroom to be ventilated. Air may be discharged at any desired point ofconduit I32 by the introduction of a register therein. One or more fansI30 may be mounted upon the rotor shaft of a variable speed electricmotor I38. Preferably a pair of such fans are thus mounted at therespective sides, of the motor in well-known manner. preferred tosubstitute for the electric motor a compressed air motor I40, such asshown in Fig. 1. This is especially desirable where the air conditioningsystem is under thermostatic control and where it is desiredintermittently to vary the speed of the fan in accordance withtemperature conditions within the system. A compressed air conduit I42and an air discharge conduit I43 are connected with the air-motor I40for obvious p rposes. For controlling the amount of fresh air drawn intothe room by the fan, I30, in accordance wit temperature conditionsexisting within the mo or at a selected point in the ventilation system,a thermostat I44 of suitable type is placed at the point in the systemto be employed in connection with such regulation. The said thermostatis arranged in an electric circuit which also includes the variablespeed motor. I38; or, in case an air motor 'is used, the thermostat 0preferably is connected with a thermostatically- .operated valve I45 inthe compressed air line leading to the air motor as shown in Fig. 1. Inany event the construction of the thermostat and the arrangement of theassociated elements of the circuit controlling operation of the motor issuch that the speed of the motor varies with changes in the temperatureof the air around the thermostat, thereby changing the rate'of flow offresh air to the room from outside in accordance with temperaturevariations within the room or other space being ventilated, or elsewherein the system.

In practice the thermostat I44 conveniently is placed in the air conduitI32 into which air from In many instances it is the fan I30 discharges.Obviously however the thermostat can be located either in the room beingventilated or wherever it may be serviceable for the purpose indicated.

As more clearly shown in Fig. 4, the floor I47 within the casing I4 isat a lower elevation than the room floor I46, and the former slopes downward slightly in the direction away from the room and toward one or moredrain conduits I48, thus providing drainage for any moisture condensingin the casing I4 or flowing thereto through the louvers I4 duringcleaning of the room.

Instead of employing heat transfer elements of the type illustrated,other well-known heattransfer means may be utilized. In certaininstances individual separately-controlled radiator elements may be usedin the respective chambers 34, 36; or the heat-transfer elements in thevarious chambers 34 may be directly connected with one header pipe,carrying steam, cold brine or other heat transfer fluid,and those in aplurality of compartments 36 within the same or adjacent casings may beconnected with a second header pipe carrying steam, cold brine, or otherheat-transfer fluid at a higher or lower temperature than that carriedby the first-named header.

The practice of the invention will be described in connection with theventilation of a single room. However, obviously the invention can beapplied to any number of rooms; and a single room may contain a numberof units such as here described, each adapted to work in conjunctionwith or independently of the other.

In the preferred practice of the invention in connection with theheating and ventilating of a room,steam or other suitable heating fluidis passed through the conduit 62 and radiates heat to the air flowingwithin the respective chambers 34 and 36. The louvers I0 and 14 in therespective top and front of the casing I4 are open, and the heatcommunicated to the air passing the conduit 62 induces naturalconvection currents,

thereby drawing air from the lower portion of the room and projecting itupwardly past the radiating surfaces 66 and thence through the openings68 into the room at points directly in front of the windows. This heatedair rising in front of each window is cooled and diluted by and thefilter element carried thereby,-after' which the air flows downwardly tochambers 38 and 40, and thence uninterruptedly flows to chamber 36. Hereit is drawn upwardly around the heating elements 66 and thence isprojected through conduit I32 to the manifold I34 adjacent the ceilingof the room through which it flows, gradually escaping into the roomthrough the louvered openings I36 which are adjusted to effect airdistribution into the room in any desired manner.

During this operation thedoors 48 and 52 are closed so thatcommunication between the chamber 34 and the other chambers within thecasing I4 is cut off. This insures that all of the filtered fresh air,after suitable heating thereof, is conducted directly to points remotefrom the windows and walls of'the room. The thermostat I44 located inthe wall conduit I32 is adjusted to control the flow of air past theelements 66 and thus to maintain the air flowing through the conduit,I32 at the desired temperature.

Preferably the thermostat is adjusted to introduce conditioned air intothe mid portion of the room at a temperature substantially lower thanthat of the recirculated air in order to allow for the subsequentheating effect of the ing through the chamber -34 by mounting the formerat a strategic position within the room being ventilated where thethermostat is subject to the effect of the conditioned, recirculated airas well as of the fresh air. 1 The pneumatic device 45 for controllingth damper 44 may be operatively connected with the compressed airconduit to the air motor where the latter is employed; or the device 45may be connected through a compressed air line to any point adapted forremote control of the damper 44. The damper-operating device 45 isconnected with the compressed air line to the motor in such manner thatthe damper is maintained in open position at all times when air underpressure is present in the air line. When this pressure is released,-forinstance at night when the heat to the heat exchange apparatus is cutoff and the air compressor is stopped,-the device functions in wellknown. mannen-as by means of a valve controlled by a spring-presseddiaphragm-to cut off the'flow of fresh air into the building. Otherdevices adapted to so function and to provide automatic control of thefresh air flowing throughthe hollow window sill may be substituted forthat mentioned; and such devices may be operated electrically or in anyother manner, from either a proximate or a remote point of control.

In the practice of the invention for cooling as cold water, brine or thelike is flowed through the lateral pipe 62,- the doors 48 and 52 beingopen. and the louvers I0 and 14 being closed. Air from the outside isdrawn through the hollow window-sill construction and the filter elementtherein in the manner previously described. A portion of the air flowsdirectly to chamber and thence into chamber 36 where it is drawnupwardly around the cooling elements 66 by action of the fan I30, and isdirected into the mid-portion of the room adjacent the celling throughconduits I32 and I34.

A portion of the fresh air flowing into the building through the hollowwindow-sill construction passes into chamber 34 through the opening 46,and is thereafter drawn upwardly around the cooling plates 66 and thencethrough and ventilating a room, a cooling medium such open doorway 52 tothe chamber 36 under action of the fan I30, where the cooled air mixeswith that flowing upwardly therein.

During this cooling operation it will be noted that there is norecirculation of room air in front of the windows. latter ordinarilywill be at least partly open, thus providing ample ventilation andcooling at such points. All of the air being conditioned is distributedin theroom at suitable points near the In warm weather the ceiling andat distances remote from the walls thereof.

In operations for heating and ventilating a room or building, where coldfresh air must rapidly be heated over a fairly wide temperaturerange,-in some cases from 0 F. to 70 F. a very fer chambers, vheat-transfer chambers. damper-controlled openhigh velocity flow of theair over a limited heat transfer member maintained at a suitabletemperature serves most efliciently for the heating ofvthe room. On theother hand, in cooling and ventilating operations where it is necessaryto cool the fresh air through a narrow temperature range, often in theneighborhood of, but 8 or 10,-the cooling of the fresh air requirespassing the air overa much larger heat-exchange surface than is employedin heating fresh air,

especially since the heat exchange surface used 'for cooling ismaintained at a more moderate temperature, than that used for heatingpurposes-the increased heat-exchange surface being usedto' compensatefor the slower rate of heat-exchange where heat-transfer members havinga more moderate temperature are used. The temperature of the coolingmedium may be conveniently so selected that the temperature of the airwill be reduced in the neighborhood of to 30 F. during its period ofcontact with the cooling medium.

Any moisture condensed around the cooling coils during circulation ofair around the same in the warm summer months is drained away buildingswhich comprises a casing disposed along the side of a room to beventilated, the said room having a' wall, a window in the said wall,means dividing the easing into an air inlet chamber extending the lengthof thecasing and a plurality of longitudinally-aligned heat-transdampersconnecting adjacent ings controlling communication between the air inletchamber and the respective heat-transfer chambers, means fordrawing airfrom the inlet chamber and for conducting the same over heatexchangeelements in the heat-transfer chambers and thence into the upper portionof the room at, one or more points remote from the said wall and window,and automatic means associated with the last named means for cutting offthe flow of air through the inlet chamber when the air-drawing means isinoperative.

2. Air conditioning and ventilating system for buildings which comprisesa wallcasing disposed along a side wall of a room to be ventilated,which side wall has at least two windows therein, the said casing beingdivided by partitions into -a plurality of chambers including an airinlet chamberextending the length'of the casing, an air-conditioningchamber disposed directly in front of each window, an air-conditioningchamber within the casing at a point intermediate adjacent windows,means controlling, communication between adiacent air-conditioningchambers, means controlling communication between the air inlet chamberand each of the respec-- tive air-conditioning chambers located in frontof a corresponding window, heattransfer elemerits in each of theair-conditioning chambers, louver-controlled openings respectively inthe top and in the lower portion of they front of each of thoseair-conditioning chambers which is located in front of each window, anda motor-driven fan adapted to draw air from the air inlet chamber pastthe heat transfer elements in each of the other airconditioning chambers5 and to discharge the air into the upper part of the room at pointsremote from the walls and windows thereof.

3. Air conditioning and ventilating system for buildings which comprisesa casing disposed along a side wall of a room having at least one windowtherein, the said casing having its top below the level of thewindow-sill, a longitudinal partition in the casing dividing thelatterinto an air inlet chamber and an air-conditioning chamber,transverse partitions dividing the latter chamber into a plurality ofcompartments, damper-controlled openings in each of the last-namedpartitions permitting controlled communication between all of thecompartments of the air-conditioning 20 chamber, heat-transfer means ineach of the said compartments, a damper-controlled pas-- sagewayconnecting the air inlet chamber and alternate air-conditioningcompartments, each intermediate air-conditioning compartment be-'2 ingin communication with the air inlet chamber through an automaticdamper-controlled I opening, an air circulation fan operativelyamociated with each intermediate air-conditioning compartment, means fordriving the said fan including a variable-speed motor, and an airconduit leading from each of the said intermediate compartments topoints in the upper part of the room remote from the said wall.

4. Air conditioning and ventilating system for buildings which comprisesa casing disposed along a side wall of a room having at least one windowtherein, a longitudinal partition in the casing dividing the latter intoan air inlet chamber and air-conditioning chamber, transverse 4opartitions dividing. the latter chamber into a plurality of"compartments, damper-controlled openings in each of the last-namedpartitions permitting controlled communication between all of the saidcompartments, heat-transfer means in each of the said compartments, adamper-controlled passageway controlling com munication between theair'inlet chamber and alternate air-conditioning compartments, the

remaining air-conditioning compartments being in communication with theair inlet chamber through an opening controlled by a pneumaticallyoperated damper, an air circulation fan in free communication with thelast-named airconditioning compartments, and means for driving the saidfan including a compressed air-operated motor, and an air conduitleading from each of the said intermediate compartments to points in theupper part of the room.

5. Air conditioning and ventilating system for buildings which comprisesa casing disposed along a side wall of a room having at least twowindows therein, said casing having its top bea low the level of thewindow-sills, a longitudinal partition in the casing dividing the latterinto 55 an air inlet chamber and an air-conditioning chamber, transversepartitions dividing the latter chamber into a pluralityiof compartments,damper-controlled openings in each of the lastnamed partitionspermitting controlled commun- 7 ication between all of the saidcompartments,

heattransfer means in each of the said compartments, a damper-controlledpassageway coning air-conditioning compartments being in communicationwith the air inlet chamber through respective passageways, an automaticdamper in each of the last named passageways,

an air circulation fan in free communication with the said remainingair-conditioning compartments, means for driving the said fan includinga variable-speed motor, an air conduit leading from. each of the saidremaining com- 10 partments to points in the upper part of the room, andtemperature responsive means cooperatively associated with the motor forvarying the speed of the latterr 6. The process for the ventilation of aroom which comprises .filtering fresh air, heating the filtered air andthereafter flowing the same into v the room to be ventilated at pointsremote from the building walls and the windows, concurrently withdrawingair from the room, reheating the said air and flowing the heated airupwardly into the room in front of and directly below each windowthereby to temper any air entering the room adjacent such point, andcontrolling the fiow of fresh air into the room by the temperature ofthe fresh air after it has been heated.

7. The process for conditioning the air of a room having windowstherein, which comprises filtering fresh air, heating the filtered airand flowing it 'to selected points in the upper part so of the room;simultaneously heating other por- ,tions of air from within the room andflowing it upwardly into the room in front of each window, andcontrolling the passage of air flowing in front of each windowindependently of the as flow of the fresh air entering the room near theupper part thereof.

8. The process for the ventilation of-a room having walls and a window,which comprises drawing fresh air from outside and filtering the 40same, rapidly heating the filtered air to a preselected temperature nearbut below that within such room by passing the air at high velocityadjacent a high temperature heat transfer medium, flowing the thus.heated air into the room to be ventilated at points remote from the roomwalls and the window, concurrently withdrawing air from the roomadjacent the floor thereof, reheating the same and flowing the thusheated air upwardly into the room adjacent the window, and controllingthe rate of flow of fresh conditioned air into the room by thetemperature of said conditioned air after its passage past the saidheating transfer medium.

9. The process for cooling and ventilating a room which comprisesdrawing a stream of fresh air from outside while filtering the said air,thereafter separating the stream of air into two portions, subjectingeach of said portions to the indirect action of a cooling fluid,thereafter com- 50 bining the said portions and introducing the thuscooled and filtered air into the .upper portion of the room to beventilated at points remote fromthe wall'and windows thereof.

10. The process for cooling and ventilating a room which comprisesdrawing a stream of fresh air from outside while filtering the said air,thereafter separating the stream of air into two portions, subjectingeach of said portions .to the indirect action of a. cooling fluid,thereafter combining the said portions and introducing the thus cooledand filtered air into the upper portion of the room to be ventilated atpoints remote from the wall and windows thereof, and controlling therate of introduction of the cooled 1O filtered air into the room inaccordance with the degree of variation of the temperature thereof froma preselected temperature.

, 11. The process for cooling and ventilating a room which comprisesdrawing a stream of fresh air from outside while filtering the said air,5

thereafter separating the stream of air into two portions, concurrentlypassing each of the said portions into heat exchange relationship with aseparate cooling medium, thereafter combining the said portions, andflowing the thus. cooled 1 0 and ventilated air into the upper portionof the room to be ventilated.

12. The process for cooling and ventilating a room which comprisesflowing a stream of fresh air from outside while filtering the said air,15 thereafter separating the stream .of air into two portions,concurrently flowing each of the said portions into contact with a,cooling medium having a temperature adapted to effect a reduction in thetemperature of the air of from 5 to 20 30 F. during its contact with thesaid medium, thereafter combining the said portions and introducing thethus cooled and filtered air into the upper portion of the room to beventilated.

13. The process for conditioning the air of a 25 room having windowstherein, which comprises drawing a stream of fresh air from outsidewhile filtering the air, heating. the filtered air and forcing it toselected points in the upper part of the room, simultaneously heating aportion of so air drawn from within the room, and flowing the latterupwardly into the room in front of each window, controlling the upwardflow of air in front of each window independently of the flow of freshair enteringthe room, and shutting off 88 the fiow of the said filteredfresh air to the room at all times when such filtered air is not beingheated. s

14. An air conditioning and ventilating system for buildings, whichcomprises a wall casing 40 disposed along a wall of a room to beventilated, the said wall having at least twowindows therein, the saidcasing being divided by partitions into a plurality of chambersincluding an air inlet chamber extending the length of the cas- 45 ing,a hollow window sill defining a compartment in communication at itsrespective ends with the air outside the building wall and with the saidwall casing, a filter member removably mounted within said compartment,an air-con- 60 ditioning chamber disposed directly in front of eachwindow, an air-conditioning chamber within the casing at a pointintermediate adjacent windows, means controlling communication betweenadjacent air-conditioning cham- 55 bers, means controlling communicationbetween the air inlet chamber and each air-conditioning chamber locatedin front of a corresponding window, heat transfer means in eachair-conditioning chamber, adjustable closure'members 60 respectively inthe top and in the lower portion of those air-conditioning chamberslocated in front of each window, and means adapted to draw air from theair inlet chamber past the heat transfer means and to discharge the air55 into the upper part of the room at points remote from the walls andwindows thereof.

15. Air conditioning and ventilating system for buildings, whichcomprises a casing disposed along a side wall of a room. having at leastone 7 window therein, the said window having a hollow window silladapted to establish communication between the air outside of thebuildings and the said casing, a filter-supporting member and filterelement removably mounted within 1 the sill, a longitudinal partitioninthe casing dividing the latter into an air inlet chamber and anair-conditioning chamber, transverse partitions dividing the latterchamber'into a plurality of compartments, alternate compartments beingdisposed respectively in front of a window,

and intermediate compartments being disposed between adjacent, windows,adjustable closures in the transverse partitions establishing controlledcommunication between the said compartments, heat transfer means in eachcompartment, means establishing direct controlled communication betweenthe air inlet chamber and each of the said window compartments, aconduit leading from each of the said intermediat compartments topointsin the upper part of the room remote from the said walls, andmeans operatively associated with each intermediate compartment adaptedto draw air into the air inlet chamber through the filter and to flow itpast the heat transfer elements and discharge the air in part at leastinto the upper portion of the room at a. point remote from the walls andwindows.

16. Air conditioning and ventilating system for buildings whichcomprises a wall casing disposed along a. side wall of a room to beventi lated, which side wall has at least two windows therein, the saidcasing being in communication with the air outside the room and dividedby partitions into a plurality of chambers including an air inletchamber extending the length of the casing, an air-conditioning chamberdisposed directly in front of each window, an air-conditioning chamberwithin the casing at a. point intermediate adjacent windows, trollingcommunication between adjacent airmeans C011- conditioning chambers,means controlling comdow, and a motor-driven fan adapted to draw 20 airfrom the air inlet chamber past the heat transfer elements in each ofthe other air-conditioning chambers and to discharge the air into theupper part of the room at points remote from the Walls and windowsthereof.

1 JAMES A. SPACE.

